One of the main problems is the commoditization of salmon and race toward cheapest feed ingredients just like the other animal proteins such as cattle, poultry and pork. Its just that Salomon need marine epa and dha omega-3 oils and proteins while not being able to process carbs that well. There are promising alternatives but they have a hard time to compete since you cant carry the cost to the consumers. Ie few are willing to pay extra to get a Salomon fed with insect protein and gmo oil from plants or algae. Switching feed ingredients also have their own impacts that need to be taken into account.
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